... sample is a plutonic rock dominated by mostly anhedral feldspar and a lesser amount of quartz . The crystalline structure is coarse. Maximum crystal dimension is 5.6 mm (feldspar) and minimum is .04 mm (quartz). There is a fairly continuous ...

... rock dominated by mostly anhedral quartz and feldspar . The crystalline structure is coarse. Maximum crystal dimension is 4.8 mm (feldspar). There are two clear modes, one are the original, and larger, ...

... size range from about 1.4 to .4 mm. Relative quartz and feldspar contributions are difficult to estimate due to the impact of large ... appearance, excluding the large quartz porphyroblast s, feldspar would predominate. Feldspar twinning is not common but polysynthetic ...

... metamorphic, or even arenite rock fragments. Rare feldspar , opaque, and other mafic mineral grains are also present. Based on ... a significant amount of very fine grained quartz and perhaps feldspar included in this matrix. This may indicate the presence of small ...